Abstract: A valve (8) is fitted into a channel arrangement having a first inner channel (1) which extends longitudinally carrying a first fluid. An outer channel (4) encloses channel (1) and is intended for the passage of a second fluid at a lower temperature. The valve assembly has at least two valves to control flow through the outer channel (4). The outer channel (4) is made up of two. U-shaped channel portions (12,13) each extending outwardly with regard to the inner channel (1). Each of the channels (12,13) has at least one of said first valves (9) to control fluid flow and the inner channel (1) may have another valve (10) to control it's flow.

Abstract: A shaft device for a valve, comprises a shaft supported in a bearing and extending into a relatively warm space, a sleeve provided between the shaft and the bearing, and cooling channels arranged in the border area between the shaft and the sleeve for cooling of the bearing, and wherein the axial length of the sleeve is longer than the axial length of the bearing.